package thread;

import java.util.*;

public class SyncDemo4 {
    public static void main(String[] args) {
        //List<Integer> c = new ArrayList<>();

        //List<Integer> c= Collections.synchronizedList(new ArrayList<>());
        Set<Integer> c = Collections.synchronizedSet(new HashSet<>());

        Thread t1 = new Thread(){
            public void run(){
                for(int i = 0;i < 1000;i++){
                    c.add(i);
                }
            }
        };
        Thread t2 = new Thread(){
            public void run(){
                for(int i = 1000;i < 2000;i++){
                    c.add(i);
                }
            }
        };
        t1.start();
        t2.start();
        try {
            Thread.sleep(50);
        } catch (InterruptedException e) {

        }
        System.out.println(c.size());
    }
}
